State profile · Near median Poor share

New Hampshire bridge safety

According to the Federal Highway Administration's 2024 National Bridge Inventory, condition ratings, load ratings, and Poor-condition shares for every public highway bridge in New Hampshire.

2,542
Public bridges
51.6%
Good condition
7.5%
Poor condition

New Hampshire holds 2,542 public highway bridges (#44 of 52 by inventory) with a 7.51% Poor share (#18 of 52 by Poor share).

That is 7.5% of the state's inventory, against an average of 7.5% across the 54 states and territories with Poor-rated bridges on file, which places it 35 of 54 ordered from the lowest Poor share upward. A bridge is rated Poor when its weakest applicable component scores 4 or below on the inspecting agency's 0-9 scale, so the category is a maintenance and funding signal rather than a closure order or a live crossing-safety verdict.

Inventory: FHWA NBI 2024 · last ETL August 2026

Total Bridges

2,542

Public highway bridges in New Hampshire

Good Condition

51.6%

1,312 bridges rated 7-9

1.6pp vs 50% benchmark

Poor Condition

7.5%

191 bridges whose lowest applicable component is rated 0-4

-0.0pp vs national avg 7.5%

New Hampshire vs national bridge condition

New Hampshire - Good condition share 51.6%
National avg

Share of bridges rated 7-9 on the FHWA 0-9 scale (deck, superstructure, substructure all good).

New Hampshire - Poor-condition share 25.0%
National avg

Lower is better. Bar maxes at 30% (worst-state ceiling). National average sits at 7.5%.

New Hampshire in the national condition pattern

Each point is a state or territory in the FHWA NBI; the highlighted point is this profile.

Inventory size and Poor-condition share are different measures: New Hampshire has 2,542 bridges and a 7.5% Poor-condition share in the 2024 NBI, rank #35 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold. Scatter plot of 54 data points. 0%10%20%30%40% 0k20k40k60k Public bridges in inventory (thousands) Poor-condition share (%) NH, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 7.51%AL, Public bridges in inventory (thousands): 16.2k · Poor-condition share (%): 3.35%AK, Public bridges in inventory (thousands): 1.7k · Poor-condition share (%): 7.89%AZ, Public bridges in inventory (thousands): 8.6k · Poor-condition share (%): 1.15%AR, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 5.43%CA, Public bridges in inventory (thousands): 25.8k · Poor-condition share (%): 5.91%CO, Public bridges in inventory (thousands): 9k · Poor-condition share (%): 4.82%CT, Public bridges in inventory (thousands): 4.4k · Poor-condition share (%): 4.72%DE, Public bridges in inventory (thousands): 0.9k · Poor-condition share (%): 1.26%DC, Public bridges in inventory (thousands): 0.3k · Poor-condition share (%): 1.95%FL, Public bridges in inventory (thousands): 13k · Poor-condition share (%): 2.79%GA, Public bridges in inventory (thousands): 15.1k · Poor-condition share (%): 1.59%GU, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 12.77%HI, Public bridges in inventory (thousands): 1.2k · Poor-condition share (%): 6.53%ID, Public bridges in inventory (thousands): 4.6k · Poor-condition share (%): 4.9%IL, Public bridges in inventory (thousands): 26.9k · Poor-condition share (%): 9.35%IN, Public bridges in inventory (thousands): 19.5k · Poor-condition share (%): 5.22%IA, Public bridges in inventory (thousands): 23.7k · Poor-condition share (%): 19.16%KS, Public bridges in inventory (thousands): 24.9k · Poor-condition share (%): 5.26%KY, Public bridges in inventory (thousands): 14.5k · Poor-condition share (%): 7.37%LA, Public bridges in inventory (thousands): 12.7k · Poor-condition share (%): 11.48%ME, Public bridges in inventory (thousands): 2.5k · Poor-condition share (%): 15.41%MD, Public bridges in inventory (thousands): 5.5k · Poor-condition share (%): 4.56%MA, Public bridges in inventory (thousands): 5.3k · Poor-condition share (%): 8.88%MI, Public bridges in inventory (thousands): 11.4k · Poor-condition share (%): 11.27%MN, Public bridges in inventory (thousands): 13.5k · Poor-condition share (%): 4.44%MS, Public bridges in inventory (thousands): 16.7k · Poor-condition share (%): 6.03%MO, Public bridges in inventory (thousands): 24.6k · Poor-condition share (%): 8.95%MT, Public bridges in inventory (thousands): 5.2k · Poor-condition share (%): 6.81%NE, Public bridges in inventory (thousands): 15.4k · Poor-condition share (%): 7.9%NV, Public bridges in inventory (thousands): 2.1k · Poor-condition share (%): 1.14%NJ, Public bridges in inventory (thousands): 6.8k · Poor-condition share (%): 6.01%NM, Public bridges in inventory (thousands): 4k · Poor-condition share (%): 4.51%NY, Public bridges in inventory (thousands): 17.6k · Poor-condition share (%): 9.43%NC, Public bridges in inventory (thousands): 19.2k · Poor-condition share (%): 6.76%ND, Public bridges in inventory (thousands): 4.3k · Poor-condition share (%): 10.98%OH, Public bridges in inventory (thousands): 26.7k · Poor-condition share (%): 4.74%OK, Public bridges in inventory (thousands): 22.9k · Poor-condition share (%): 7.7%OR, Public bridges in inventory (thousands): 8.3k · Poor-condition share (%): 4.61%PA, Public bridges in inventory (thousands): 23.3k · Poor-condition share (%): 12.58%PR, Public bridges in inventory (thousands): 2.4k · Poor-condition share (%): 13.92%RI, Public bridges in inventory (thousands): 0.8k · Poor-condition share (%): 15.2%SC, Public bridges in inventory (thousands): 9.5k · Poor-condition share (%): 6.17%SD, Public bridges in inventory (thousands): 5.9k · Poor-condition share (%): 16.36%TN, Public bridges in inventory (thousands): 20.4k · Poor-condition share (%): 4.41%TX, Public bridges in inventory (thousands): 56.7k · Poor-condition share (%): 1.23%UT, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 2.91%VT, Public bridges in inventory (thousands): 2.9k · Poor-condition share (%): 2.9%VI, Public bridges in inventory (thousands): 0k · Poor-condition share (%): 29.17%VA, Public bridges in inventory (thousands): 14.1k · Poor-condition share (%): 3.39%WA, Public bridges in inventory (thousands): 8.5k · Poor-condition share (%): 5.45%WV, Public bridges in inventory (thousands): 7.3k · Poor-condition share (%): 18.64%WI, Public bridges in inventory (thousands): 14.4k · Poor-condition share (%): 6.52%WY, Public bridges in inventory (thousands): 3.1k · Poor-condition share (%): 6.51%
Inventory size and Poor-condition share are different measures: New Hampshire has 2,542 bridges and a 7.5% Poor-condition share in the 2024 NBI, rank #35 of 54 jurisdictions ordered from the lowest share upward. The dashed comparisons mark the national average state rate and the midpoint of the plotted inventory range; neither is a live safety or closure threshold.

New Hampshire vs all states by public bridge inventory

Where this state's FHWA NBI public-highway bridge count sits among every state and territory on PlainBridges

2,542 44th of 54 higher than 10 of 54 states

States and territories, banded by public bridge inventory size

Each bar is a band; taller bars hold more states. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.

Source FHWA National Bridge Inventory · 2024

Read the rank neighborhood for New Hampshire

The highlighted point is New Hampshire: 2,542 bridges and 7.51% in Poor condition, rank #35 of 54 jurisdictions ordered from the lowest share upward. The five jurisdictions immediately above and below New Hampshire on that same Poor-share ordering:

  • Montana: 5,224 bridges · 6.81% Poor
  • Kentucky: 14,548 bridges · 7.37% Poor
  • New Hampshire: 2,542 bridges · 7.51% Poor
  • Oklahoma: 22,917 bridges · 7.70% Poor
  • Alaska: 1,685 bridges · 7.89% Poor

The full national sortable table lives on the rankings page.

Material families in New Hampshire

Exclusive FHWA material families across all 2,542 bridges in this state; continuous variants fold into the parent family. Orthogonal to the Poor-share scatter above.

Who maintains New Hampshire’s inventory

State agency holds 58.0% of the 2,542 public highway bridges filed under New Hampshire in the 2024 NBI, the agency-of-record split for this state, not a condition verdict.

When New Hampshire’s bridges were built

Pre-1950 construction accounts for 26.2% of the 2,542 bridges with a recorded original year in New Hampshire. Era bands are orthogonal to the Poor-share ranking above.

Condition Distribution

New Hampshire51.6%40.9%GoodFairPoor
Bridge inventory deck-condition mix - New Hampshire (FHWA NBI)

Counties (10)

Belknap 112 Carroll 193 Cheshire 192 Coos 188 Grafton 544 Hillsborough 385 Merrimack 326 Rockingham 308 Strafford 136 Sullivan 158

New Hampshire vs nearby ranks

Adjacent states by Poor-condition share (lower share = better)

States are ranked by the share of bridges whose lowest applicable component rating is 4 or below. This describes recorded condition; it does not measure funding effectiveness or live crossing safety. States here sit immediately above and below New Hampshire on the same metric.

MT

Montana

6.81% top marginal rate
Structure
Progressive
Burden @ $100K
$5,224

KY

Kentucky

7.37% top marginal rate
Structure
Progressive
Burden @ $100K
$14,548
Selected

NH

New Hampshire

7.51% top marginal rate
Structure
Progressive
Burden @ $100K
$2,542

OK

Oklahoma

7.70% top marginal rate
Structure
Progressive
Burden @ $100K
$22,917

AK

Alaska

7.89% top marginal rate
Structure
Progressive
Burden @ $100K
$1,685

Bridges Needing Most Attention in New Hampshire

Six lowest-condition bridges in New Hampshire, ranked by the portal's composite display score. Inspection intervals are risk-based under current NBIS rules.

THORNTONS FERRY RD

Poor

Over: BEAVER BROOK

3.2 MI FR MERRIMACK TL, Hillsborough, NH

Built 1970 Load: 0.0 t ADT: 388

GRIST MILL HILL RD

Poor

Over: INDIAN RIVER

2.01 MI FROM GRAFTON TL, Grafton, NH

Built 1956 Load: 0.0 t ADT: 404

GRANITE ROAD

Poor

Over: SOUTH RIVER

0.3MI. RTE 153, Carroll, NH

Built 1920 Load: 0.0 t ADT: 90

OLD COUNTY RD N

Poor

Over: COLLINS BROOK

2.4 MI. DEERING TL, Hillsborough, NH

Built 1981 Load: 0.0 t ADT: 90

SOUTH ROAD

Poor

Over: MINNEWAWA BROOK

0.9 MI FR DUBLIN TL, Cheshire, NH

Built 1950 Load: 0.0 t ADT: 90

STEARNS BROOK ROAD

Poor

Over: STEARNS BROOK

0.4 MI FR SUCCESS TL, Coos, NH

Built 1950 Load: 0.0 t ADT: 90

All Bridges in New Hampshire

BRYANT ROAD

Good

Over: MILL BROOK

0.8 MI FROM NH ROUTE 113, Carroll, NH

Built 1940 Load: 14.5 t ADT: 90

CONVERSE ROAD

Good

Over: BROOK

TOWN RD, Hillsborough, NH

Built 1980 Load: 14.5 t ADT: 90

LOWER MEADOW ROAD

Good

Over: MILL BROOK

0.11 MI. RTE 4, Grafton, NH

Built 2013 Load: 15.1 t ADT: 90

STEWART ROAD

Good

Over: BROOK

0.29MI DANBURY TL, Merrimack, NH

Built 1960 Load: 15.1 t ADT: 90

OLDS ROAD

Good

Over: DODGE BROOK

0.3 MI E NH 10, Sullivan, NH

Built 2022 Load: 15.2 t ADT: 90

COLLINS BROOK ROAD

Good

Over: COLLINS BROOK

0.3 MI FROM NH RTE 111, Rockingham, NH

Built 1989 Load: 15.5 t ADT: 481

RIVER ROAD

Good

Over: DODGE BROOK

.67 MI. N. JCT. NH 123-A, Sullivan, NH

Built 1933 Load: 16.3 t ADT: 174

ALLEN ROAD

Good

Over: COLD RIVER

.6 MI FROM LEMPSTER TL, Sullivan, NH

Built 1975 Load: 16.3 t ADT: 1,214

HOBBS HILL ROAD

Good

Over: BROOK

TOWN RD, Merrimack, NH

Built 1990 Load: 16.3 t ADT: 90

GRIFFIN HILL ROAD

Good

Over: WARREN BROOK

0.05 MI N OF NH 123, Cheshire, NH

Built 1920 Load: 16.8 t ADT: 90

NH 11

Good

Over: MAD RIVER

1.7 MI NEW DURHAM TL, Strafford, NH

Built 1955 Load: 16.8 t ADT: 11,942

TYLER ROAD

Good

Over: BLACKWATER RIVER

0.1 MI N HOPKINTON TL, Merrimack, NH

Built 1937 Load: 16.8 t ADT: 90

ORANGE ROAD

Good

Over: INDIAN RIVER

100 FT E. OF JCT. NH 118, Grafton, NH

Built 1946 Load: 18.0 t ADT: 1,292

RESERVOIR ROAD

Good

Over: PISCATAQUOG RIVER

TOWN RD, Hillsborough, NH

Built 1973 Load: 18.1 t ADT: 195

LOCKHAVEN ROAD

Good

Over: CRYSTAL LAKE OUTLET

3.4 MI FR GRAFTON TL, Grafton, NH

Built 1982 Load: 18.1 t ADT: 924

FDR 71

Good

Over: CULHANE BROOK

MAP 13, Coos, NH

Built 1960 Load: 18.5 t ADT: 50

FOWLER RIVER ROAD

Good

Over: FOWLER RIVER

1 MI FROM BRISTOL T.L., Grafton, NH

Built 1954 Load: 19.0 t ADT: 90

NH 26

Good

Over: CORSER BROOK

3.0 MI W OF RTE 16, Coos, NH

Built 1954 Load: 19.1 t ADT: 971

BUNKER HILL ROAD

Good

Over: MILL BROOK

2.1 MI. RTE.113, Carroll, NH

Built 2020 Load: 19.1 t ADT: 90

STRING BRIDGE ST

Good

Over: SQUAMSCOTT RIVER

120FT RTE 108, Rockingham, NH

Built 1935 Load: 19.6 t ADT: 1,533

STRING BRIDGE ST

Good

Over: SQUAMSCOTT RIVER

0.05MI RTE 108, Rockingham, NH

Built 1935 Load: 19.6 t ADT: 1,533

MIDDLE ROAD

Good

Over: MCDOWELL RESERVOIR

.9 MI FR PETERBORO TL, Hillsborough, NH

Built 1950 Load: 19.6 t ADT: 481

TUTTLE ROAD

Good

Over: LITTLE RIVER

0.10 MI FR MAST RD, Strafford, NH

Built 1959 Load: 20.0 t ADT: 718

NH 1B

Good

Over: SOUTH MILL POND

.6 MI FROM JCT US 1, Rockingham, NH

Built 1985 Load: 20.0 t ADT: 5,456

SCOTT ROAD

Good

Over: CHOCORUA RIVER

0.17 MIMS NH RTE 16, Carroll, NH

Built 2023 Load: 20.0 t ADT: 90

BUFFALO ROAD

Good

Over: STEVENS BROOK

0.56MI RUMNEY TL, Grafton, NH

Built 1947 Load: 20.0 t ADT: 90

NH106

Good

Over: TIOGA RIVER

4.0 MI S LACONIA TL, Belknap, NH

Built 1934 Load: 20.6 t ADT: 9,975

CRYSTAL LAKE ROAD

Good

Over: NELSON BROOK

2 MI NW JCT NH140, Belknap, NH

Built 2023 Load: 20.7 t ADT: 90

BAKER STREET

Good

Over: BEAVER BROOK

1.0 MI SE FROM KEENE CTR, Cheshire, NH

Built 1978 Load: 20.8 t ADT: 1,372

RIVER ROAD

Good

Over: SACO RIVER OVERFLOW

2.0 MI FROM BARTLETT TL, Carroll, NH

Built 1955 Load: 20.9 t ADT: 4,565

RIVER ROAD

Good

Over: S BR BAKER RIVER

.74 MI. NE JCT. NH 118, Grafton, NH

Built 1937 Load: 21.2 t ADT: 49

NORTHSIDE ROAD

Good

Over: UPPER AMMONOOSUC RIVER

234 FT FROM NH110, Coos, NH

Built 1862 Load: 21.2 t ADT: 375

LYMAN ROAD

Good

Over: MILL BROOK

1.69 MI NW JCT 302, Grafton, NH

Built 1926 Load: 21.4 t ADT: 562

WOODBURY ROAD

Good

Over: PISCATAQUOG RIVER

0.3 MI FROM NH114, Hillsborough, NH

Built 1940 Load: 22.3 t ADT: 90

UNION STREET

Good

Over: NUBANUSIT BROOK

0.6 MI FROM NH RTE 101, Hillsborough, NH

Built 1937 Load: 22.4 t ADT: 1,387

THORNTON GORE RD

Good

Over: JOHNSON BROOK

0.9 MI FROM WOODSTOCK TL, Grafton, NH

Built 1948 Load: 22.7 t ADT: 219

NH153

Good

Over: BRANCH RIVER

3.1 MI N MILTON TL, Carroll, NH

Built 1932 Load: 22.7 t ADT: 3,739

EAGLE POND ROAD

Good

Over: EAGLE POND OUTLET

0.15MI ANDOVER TL, Merrimack, NH

Built 1974 Load: 22.7 t ADT: 90

SKIMOBILE ROAD

Good

Over: KEARSARGE BROOK

1.16 MI FR KEARSARGE ST, Carroll, NH

Built 1950 Load: 22.9 t ADT: 90

MORRILL STREET

Good

Over: US 3 NH 11 BYPASS

2.5 MI FROM LACONIA TL, Belknap, NH

Built 1965 Load: 23.0 t ADT: 996

NH121

Good

Over: SUCKER BROOK

2.5 MI FROM MANCHESTER TL, Rockingham, NH

Built 1930 Load: 23.2 t ADT: 3,066

SHARON ROAD

Good

Over: TOWN LINE BROOK

.08 MI SE PETERBORO TL, Hillsborough, NH

Built 1970 Load: 23.2 t ADT: 251

COLBY ROAD

Good

Over: PISCATAQUOG RIVER

0.17 MI RIVER ROAD, Hillsborough, NH

Built 1962 Load: 23.3 t ADT: 667

HERMIT WOODS ROAD

Good

Over: HERMIT BROOK

0.3 MI FROM NH RTE 132, Belknap, NH

Built 2017 Load: 23.6 t ADT: 381

US202

Good

Over: ISINGLASS RIVER

2.8 MI SW ROCHESTER TL, Strafford, NH

Built 1934 Load: 23.7 t ADT: 6,222

BRIDGE STREET

Good

Over: CONNECTICUT RIVER

VERMONT STATE LINE, Coos, NH

Built 1930 Load: 23.7 t ADT: 544

FDR 11

Good

Over: E.BR. MILL BROOK

MAP 01, Coos, NH

Built 1982 Load: 23.7 t ADT: 50

MILLBROOK ROAD

Good

Over: MILL BROOK

1.28 MI S JCT 302, Grafton, NH

Built 1928 Load: 24.3 t ADT: 1,214

PLEASANT VALLEY RD

Good

Over: GREAT BROOK

0.7 MI FR GARLAND RD, Coos, NH

Built 1956 Load: 24.5 t ADT: 90

CANADA STREET

Good

Over: MINNEWAWA BROOK

170 FT FR NH RTE 101, Cheshire, NH

Built 1955 Load: 24.5 t ADT: 480

Showing 1,051-1,100 of 2,542 bridges

Related

All states → | National rankings → | Understanding conditions → | Retired SD term explained →
Data sourced from the FHWA National Bridge Inventory (NBI), latest released cycle. See our methodology for details. Retrieved and formatted by PlainBridges.

Disclaimer: This information is provided for informational purposes only and does not constitute professional advice. Data is sourced from the FHWA National Bridge Inventory (NBI). Poor condition is an inspection-record category, not a closure or unsafe-to-cross designation. Consult the bridge owner for current status.

Understanding Bridge Conditions

How FHWA rates bridge condition on a 0-9 scale.

Check Your Daily Bridges

How to look up bridge condition data for bridges on your route.

Read our methodology — how this data is sourced, computed, and verified.

What to do with this

Use New Hampshire's inventory picture to drill to a county or a specific span.

  • Browse counties in New Hampshire and open the highest-Poor shares first. County list
  • See where this state sits among peers on Poor-condition share. State rankings
  • Compare this state with another jurisdiction on the same measures. State compare

NBI condition ratings are inventory snapshots, not live crossing-safety verdicts.

Every figure on PlainBridges is rendered directly from federal source data, no number is typed in by an editor. New Hampshire Good/Fair/Poor shares and county rollups on this page are computed from the same NBI extract as the national boards; no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2024 NBI release. NBI condition categories reflect the latest reported inventory record, not a live safety, closure, or travel decision.